Carbureter.



H. A. MILLER}: F. M. ADAM'SON.

CARBURETER.

APPLICATION FILED MAY I. I916.

Patented May 29, 1917.

2 SHEETS-SHEET 2.

1711 0111?) n9 fin r 5 7 MZY/ UNITED STATES PATENT orFIoE.

IHARBY A. LFILLER AND FRANK M. ADAMSON, OF LOS ANGELES, CALIFORNIA, ASSIGN- ORS TO MASTER CABBURETOR COMPANY, 0]? L08 ANGELES, CALIFORNIA, A COB,-

roimmo'n or camronnm.

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Specification 0! Letters Patent.

Patented May 29, 1917.

Application filed May 1, 1916. Serial No. 94,548.

To all whom/it may concern:

Be 'it known that we, Hanna: A. MILLER and FRANK TM. AD MsoN, citizens of the United States, residing at Los Angeles,'in the county of Los. Angeles and State of Cali fornia, have invented anew and useful Carbureter, of whichthe following is a specification.

This invention pertains to carbureters" or liquid fuel and air mixers and more especially to the float chamber thereof and the.

'plug is not on its seat so that as said plug moves toward said seat it will be properly centered while seating in'order that the plug and seat will not beworn unevenly, such of wear producing leakage of the valve. l

Another object of this invention is toso mount the float-operated levers as to insure against the pivots of said levers getting loose, it being understood that in the use of carlmreters on automobiles, excessive vibration of the carbureter parts occurs under the usual running conditions, said vibration tending to the various parts and produce friction between the parts and consequent wear and looseness.

Another object/is to produce a device of this character in which the '-"alve plug, levers and float can readily be removed and one in which the valve plug and levers can be held securely in place regardless of their being readily removable.

Another object is to. produce a device oi this character of which the parts may be readily assembled and disassembled without the use of a wrench or other tool.

Another object is to provide for ready ac cess to the interior of the float chamber and at the same time make provision for preventing as much as possible the entrance of dust and other foreign particles to the/in terior of said float chamber.

Other objects and advantages may appear 1n the sub oine'd detail description. Theaccompanying drawings illustrate the invention:

Flgure 1 is 'a side elevation of a carbureter embodying the invention. i

F g. 2 is an enlarged elevation mainly in vertical mid section of the float chamber in Fig. 1 showing the internal mechanism.

Fig. 3 IS a plan view of Fig. 2, the cover bemg omitted for clearness of illustration. Fig. 4 1s a fragmentary elevationmainly in mid section on line indicated by I34L*,

Fig. 3.

Fig. 4" is a plan view of the strainer detached.

Fig. 5 is an elevation of the valve-seat member detached. K

Fig. 6 is an inverted plan section on line indicated by. w"-w, Fig. 5. I

Fig. 7 is a plan view from line indicated by w -a, Fig. 4, the pivot supports and valve stem being shown in cross section and Fig. 10 is a side elevation of the upper portion of the float chamber, a portion of the cover being broken away to expose to viewparts that would otherwise be hidden.

Fig. 11 is an inverted plan view of the valve plug and stem, the lovers, and the support or plate to which the lovers are attached. Two of the hangers anda portion of one of the lovers are shown in section for clearness ot'dllustration Fig. 12 is adetail showing a fragment of "the lever support and float chamber body.

The carburetor is seen complete in Fig. 1 and comprises a float chamber, indicated in general at 1, and a mixing device, indicated in general at 2, said mixi g device not being described in .dltail and being the subjct of the erein before men tioned applica ion for patent for carbureters.

The float chamber cmnprises three separable portions or members, a cylindrical chambered body 3, a cylindrical. cover 4 and a cylindrical dirt trap 5. The body 3 is provided with an outlet 6 which communicatcs with the mixing device 2, and the dirt aimed herein but 1 ber, 8111 opening outward into the interior of the source of fuel supp trap 5 is provided with an inlet -7 connected by a'fuel supply 1pipe 8 to any suitable not shown.-

The bottom 9 of the body 3 is provided with an orifice 10 into which is screwthreaded a valvc-seat member 11 in the form of a, double nipple provided with a valve seat '12 and a passage having a vertical portion 13 which communicates with laterally extendin )ortions 1a in the valve sea't I'ncmc? laterally extending portions 14 d1rt trap 5 above the level of a strainer that comprises a conical screen 15 fastened to a ring 16 flttin inside of a downwardly projectin annu ar flange 17 of the body 3. Into t e externally smooth cylindrical lower end portion 17 of the valve-seat member is screw-threaded a headed chambered cap 18, the chamber of said cap communicating with the pamage 13, 14, and the head. of said cap bearing against the outer face of the dirt trap 5 so that when the cap is screwed up tight, the rim of the dirt trap 5 will be held tightly against the edge of the flange 17 to 'form a liquid-tight joint between the body 3 and dirt trap 5. The

- screen 15 fits the portion 17 of the valve seat member.

The valve-seat member :11 extends upward to form an annular guide 19 of less diameter than the inside diameter of the valve-seat member above the valve seat 12, there being ports 20 opening from the interior of the 'valveseat member between the valve seat and guide into the interior of the body 3. to admit fluid hydrocarbons'therethrough.

The passage 13, needle valve plug-21 adapted to engage the seat 12, the stem 22 of said valve plug be ing of approximately the same diameter as the inside diameter of the guide 19, said guide thusfunctioning to maintain the valve plug 21 substantially in alinement with the seat 12, when said valve plug is raised off its seat, so that when the valve plug moves downward onto the seat it will be substantially centered relative to said seat in order that the valve lug will not strike the seat on onejside on y and thus wearthe valve .plug and seat unevenly, such uneven wear-' ing beingconducive to leakage of fluid through the valve seat when the valve plug is closed. Thus, it is clear, the construction just described will insure against the valve becoming leaky as is so often the case with carbureters now in use.

The valve stem 22 passes through thecenter of a suitable float 23 adapted to rise and fall according to the change of liquid level in the float chamber, and said float communicates its motion to the valve' stem 22 by suitable mechanism which will now be described.

1 1 is controlled by a The valve stem 22 is provided with an annular flanged collar 24 which is loosely engaged between the flanges by the inner ends of levers 25, the outer ends of said le-' vers resting loosely upon the float 23. The levers 25 are provided with pivots 26 having their ends compressed and seated between the furcations of hangers 27 which project downward from and are preferably formed integral with a support in the form of a plate 28 provided with orifices 2 9, 29.

The pcri hery of'the plate 28 seats on the rim of t e body 3 but is of less diameter than the inside diameter of the cover, 4 so I that the cover can telescope upon the body.

The hangers 27 are formed byunching portions of the plate 28 downward to form the orifices 29 and slotting said portions at 29" so that the ends of the pivots will be tightly held between ad'acent fur-cations, said. plate'being formed 0 material having more or less spring quality thereto so that the pivots will always remain tightly seated between the furcations. This is im' ortant for the reason that in prior devices t e pins are not so mounted and owing to the fact that the parts are subject to excessive vibration under runnin conditions of. the auto" mobile on which t e carbureter is mounted, said pivots tend to work loose and wear their seats, and of course when'said'pivots are loose the adjustment of the needle valve plug relative to the float is so. affected as to ermit of increased-rise of the liquid level m the float chamberand consequent'flooding of the carburetor in a manner well understood in the art.

At the edge of the plate 28 are provided downwardly extending tongues 30 formed by punching of the plate downward. These tongues 30 are resilientand just fit inside of the rim of the body 3 so to firmly hold the plate against lateral movement.

The plate 28 provided with flat spring members 31 which maybe-formed by punching portions of said plate upward. The outer ends of said spring members 31 extend beneath and engage an annular shoulder31 inside of the cover 4 so as to tend to raise said cover which is provided on the inner face of its run with inwardly pro fjecting lugs 32' formed, in this instance, by

headed pins that extend through the rim of the cover and are headed overto hold them in place. The lugs 32, when the cover '4 is being placed on the body 3, are accommodatedin recesses 33 opening from the rim of the body downward and extendingcircumferentially of said body, the upper edge ofthe circumferentially extending portion of each recessiorming a stop 34 against which the milllfonriatc lug 32 is held by pressure of tlie'sprmg members 31. The under'edges of the stops 34 extend aslant upward toward the inner ends of the reposses that the cover 4 cannot be turned relative to the body 3 without depression of the cover relativ'e to the body against the resiliently hold the cover in place and to hold the plate 28 against upward movement.

' of the float chamber.

This construction is of reat advantage in preventing looseness which so often results in carbureters from excessive vibration and which is so detrimental to the Working parts Dust is thus practically excluded from the float chamber and yet a partial vacuum will not be created in said float chamber because of the communication of the interior of said float chamber with the atmosphere through the recesses 33.

In practical operation, assuming that the fuel supply pipe 8 is connected to a' suitable source of liquid hydrocarbon supply, the level of said liquid rising in the float cham-- her body 3 will lift the float 23 and thereby operate the lovers 25 to cause downward movement of the valve stem 22 to shut off the supply.

hen the engine, to which the carburetor is -attached, is in operation the liquid hydrocarbons pass to the mixing device 2 through the (ilitlet 6, and lowering of the liquid level in the float chan'iber, as is well understood, lowers the float so as to admit a sufficient quantity of liquid hydrocarbon to the float chamber to compensate for the liquid hydrocarbons flowing through the outlet 6.

Any dirt or other foreign particles entering the dirt trap 5 through the inlet '7 will beexrluded from entering the passage 13, by reason of the screen 15, and it is clear that when it is desired to clean out the foreign particles that ha \e collected in the dirt trap 5, all that is necessary is to discon nect the supply pipe 8 from the dirt trap 5 and remove the cap .18 and at the same time remove said ilirt trap without molestation oi the strainer. This is an advantage because if it were necessary to remove the strainer in order to obtain access to the foreign matter to be removed from the dirt trap. the screen might become bent so that it would be ineffectual in straining of the fluid lrvdrorarlmn. However, if for some reason or other. it hcrol'ncs desirable to remove the strainer as well as the dirt trap,

' with this invention the strainer may be easily removed without bending of the screen, ior all that is necessary is to slip the screen with its ring out of the annular flange 17, said screen readily sliding over the smooth lower portion of the val ve-seat member so that no in'i'ury results to the screen.

The fm'cgoing will enable thoseskilled. in the art to which this invention appertains to make and use said invention.

We clan 1. In a carburetor, a float chamber body, a. valve pin to control the admission of fuel to said ody, a. float in said float chamher body, a plate having hangers, levers operated by said float and connebted to the valve plug to operate said plug and pivoted to said hangers, said plate having-spring members engaged by the cover, and said cover being provided with means to hold it toward the body against the expansion force of said spring members.

In a carburetor, a float chamber body, a valve plug to control the admission of fuel to said body, a float in said float chamber body, a plate having fnrcated hangers of spring material, levers operated by.said float and connected to the valve plug to operate said plug, and pivots for said levers, the ends of said pivots being compressed between the fur-cations of the hangers.

In a carbureter, a float chamber body having recesses extending downward from its upper edge and extending circumferentially,a valve plug to co trol the admission of fuel to said body, a oat in said float chamber body, means operated by said float and connected to the valve plug to operate said plug, a cover for the body, lugs projecting inward from the cover to engage said recesses, means supported by the body to support the plug-operating means, and spring members on said supporting means engaging the inside of the cover to force said cover outward against the upper edges of the recesses.

4. In a carbureter, a float chamber body having recesses extending downward from its upper edge and extending circumferentially, a valve plug to control the admission of fuel. to said i ody,a float in said float chamber body, a piate having hangers, levers operated bv said. float and connected to the valve plug to operate said plug and pivted to said hangers, said plate having spring members engaged by the cover, and. lugs projerting inward from the cover to engage said recesses.

5. in a carl'n'ireter, a body having an annular flange, a ring" fitting inside of said flangc,a screen fixed to said ring, a. dirt trap, mcans'forming a passage from the space above the screen to the body, a valve plug to control the flow of liquid through said passage, and means detachably holding the dirt trap in engagement with said flange, said means including a cap extending through the screen and engaging the passage-forming means.-

6. in a (alrburctcr, a body having an annular flange, a. valve-seat member extending through an orifice in the bottom of said body and provided with a vertical passage and with a laterally extending passage communicating with the vertical passage seat, a float operatively connected to thev I and provided with ,an externallysmooth portion, a dirt trap, aheaded cap screw- .-threaded into said portion and having its head engaging the outside of the dirt trap to hold said trap toward said body, and a men-fitting said*p0rtion and extending o twardly to the annular flange, and a valve .plug to control the flowlof liquid through the verticalpassage;

7. Ina; carbureter, a a valve= seat member screw-threaded into an orifice 'in the bottom of said body and provided with a passage for liquidfuel nd with'a valve seat in said passage, said seat" member being provided. with an annular guide of less diameter than the inside d i-' ameter of the seat member above the seat, there being ports between the annular .guide and the seat, avalvejstem substantially fit.-

ting said annular guide and provided with agneedle valve plug to engage said valve valve stem, a dirt trap, and a headed cap screw-threaded into the seat member and having its head engaging the outsid e of float chamber body *said cover to said the dirt trap to hold said trap toward said body. 7

8. In a carbureter a hollow body, a valve seat member projeeting into said body and pro vided with a-passage for liquid, a plate detachably ting on the rim of said body and having flat spring members, a float in the hollow body, a valve plug to control said passage and provided with a. stem extendmg through the float and through said plate, a collar on the valve stem, means mounted beneath .the platefor operatively conneeting said collar and float together, a cover having an annular shoulder engaging said s'pring members, and means cooperatingwith said sl foring members to fasten dy to hold it in place. Signed at Los Angeles, California, this 21st day of April, 1916. HARRY A'. MILLER.

FRANK M.. ADAMSON.

Witnesses:

GEORGE H. HILEs, ANNA F. SOHMIDTBAUER. 

